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Finding the Fourth Proportional to 1,235.09, 1,704.34 and 711.11

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Solution

The fourth proportional to 1,235.09, 1,704.34 and 711.11 is: 981.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.09 : 1,704.34 = 711.11 : x
  2. Step 2: Convert to fraction form
    1,235.09/1,704.34 = 711.11/x
  3. Step 3: Cross multiply
    1,235.09x = 1,704.34 × 711.11
  4. Step 4: Simplify right side
    1,235.09x = 1,211,962.92
  5. Step 5: Solve for x
    x = 1,211,962.92/1,235.09
  6. Step 6: Final answer
    x = 981.28

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.